Need advice on gear manufacturer

[70 Charger RT]

Hi, I'm looking for advice on what make of gears I should buy (or to stay away from).  I want to install new 3.23 gears in my 489 case (8 3/4) and I seem to recall someone telling me to stay away from a certain manufacturer but I can't remember who.  Search didn't help me.  Also, where is a good place to buy from?

Thanks in advance.

70 Charger RT
St. Albert, Alberta

[Chryco Psycho]

I think there may only be one mfg making the 3.23
I would call Cass @ Doctor Diff in MT
he can set you straight on what is available & good quality

[64dartgt]

I just had mine rebuilt.  They recommended Motive Gears over Richmond for quiter operation.  They said that the Richmonds tend to whine a little.  Nothing wrong with them.  Just noisier.  By the way, they told me that 3.23's weren't easy to come by but they had 3.55's in stock so I went with that.

Boy did I luck out.  My $400 core turned out to have a 489 case and the rebuildable variant of sure grip differential.  The whole shooting match...rebuild sure grip, new gears, new green bearings strip, prime and paint cost me $1560.  Only $450 of it was labor.  That also included a new fine spline yoke which was required with the Motive gear set.  I have almost $2K in the rear end, but I couldn't have bought new for that.

I dropped it off at the shop today.  They had just bolted in my rebuilt 340.  I can't wait for Friday when I take delivery 

[terrible one]

I used Motive Gear 3.55's when I built my 8 3/4 and they have been good to me. 

[John_Kunkel]

You might be surprised to find how many gears are made by Motive Gear and repackaged by the other brands.

[Chryco Psycho]

Eaton, Richmond ,Strange , Precision , Yukon , Motive are a few mfgs

[70 Charger RT]

Thanks for the advice.  I emailed people at Dr. Diff and Motive gears to see is 3.23s are available.

[charger490]

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[70 Charger RT]

Charger490.  Thanks for the link.  I looked through the catalog and found the gears start at 3.55.  It looks like 3.23 are not available from Strange either.

[64dartgt]

I found a simulation program on the net and the difference in RPM for 3.23 and 3.55 at 70 mph was only 300 rpm (if I remember correctly 3300 rpm vs 3000) or 10% so I went with the 3.55's.

[70 Charger RT]

I might just try 3.55s on for size.

[64dartgt]

I can let you know how they are with my 340 in a few days.  Day one of breaking in the new engine and new gears.  I have to take it easy for a while until everything breaks in.  Definitely a difference from highway gears for sure.  I don't have a tach though, and my speedo is now off by about a factor of 2X!